Patent GB-475950-A (GB)
Title: Winding engine control system
IPC: B66B1/12
Filed: 1936-02-17
Abstract: 475,950. Control of motors. SECURITY ELECTRIC & MANUFACTURING CO., Ltd. Feb. 17, 1936, No. 4831. Void. Convention date, July 10, 1935. [Class 38 (iii)] [Also in Groups XXX and XXVI] A control system for a winding-engine comprises an electric generator driven at a speed proportional to the speed of the engine, an electrical device controlling the operation of the winding-engine by the application of retarding forces, this device being in turn controlled by voltage generated by the generator, and means for varying the voltage controlling the said device according to the position of the cage in the shaft. A lead 14, Fig. 1, from the armature of a D.C. generator 10 includes a resistance 15 provided with tappings which are connected to contacts 16 through adjustable resistances 17. A pivoted contact maker 20 is moved over the contacts 16 as the cages are commencing or finishing a run by a rack 22 which engages the pinion 21. The rack 22 is secured to a cross-member 38, Fig. 2, the ends of which are maintained in contact with rotary cams 41, 42 by a spring 43. The cams are rotated by the winding drums 46, 47 through reduction gearing and the shafts 44, 45. A flexible lead 20<1>, Fig. 1, connects the member 20 to one end of a main control relay 23, the other end of which is connected to a resistance 19 in the other armature lead 18. The relay 23 is adjusted to open switch 23<1> if acceleration is too rapid, the midrun speed is too great, or retardation is insufficient. The resistance 19 is in circuit when winding material, and permits a higher speed before the critical voltage is impressed on the relay. A voltage indicator 24 is in parallel with the relay 23, and a warning signal may be positioned similarly. A proving relay 25 is connected across the leads 14, 18 and normally holds closed a switch 251 in the line 13. The switch 25<1> is also held closed, except at one point of the run by a cam 26 which is rotated once during a run, thus permitting an automatic check. This switch can be short-circuited by a manually actuated switch 28. An actuating contactor 30 is connected with supply by the main control line 13, and when energized maintains closed the switches 31, 32 and 33 and keeps open the switch 34. The switches 31 32 and 33 are connected in the lines of the reversing gear solenoid 31<1>, throttle solenoid 32<1> and normal braking solenoid 33<1>, respectively. When these solenoids are de-energized by opening one of the switches in the line 13, the reversing gear is moved into neutral, the throttle is closed, and normal braking is applied, or in the case of an electrically driven winder, the main motor switch is opened and the brakes applied. The switch 34 is in the circuit of emergency braking solenoid 34<1>, but this circuit is only completed on closure of one of two paralleled limit switches 34<2>, 34<3>, one of which is closed as its associated cage reaches a certain distance from the top of the shaft. Consequently severe emergency braking is applied only if the normal braking is inadequate and the cage is travelling at excessive speed near the end of the run. Limit switches 35, 36 in the line 13 are actuated by movement of the cages beyond the upper and lower landings, and can be short-circuited by a manually actuated switch 37 for cage inspection. The switches 35, 36, 34<2>, and 34<3> are operated preferably by devices 60, 61, Fig. 2, on the cams 41, 42. When the conventional three rings are given by pressing one of the button switches 62<1>, the relay arm 72 is moved up three notches and closes the switch 73. This closes the circuit of the solenoid 63 through the leads 74, and switches 64, 65 and 66 are closed, thereby short-circuiting the resistance 19, maintaining the circuit to the relay 63, and completing the circuit of a relay 67 which is connected across the leads 14, 18. The relay 63 may also be placed in circuit in a different signalling system by pressing once any of the buttons 62. The energization of the relay 67 closes switches 68, 69 which complete the circuit of the relay and short circuit the resistance 19. When the switch 70 is opened at mid-run, the solenoid 63 is de-energized, and the switches 64, 65 and 66 are opened. The solenoid 67 is de-energized to permit reopening of the switches 68, 69 and the insertion of resistance 19 in circuit when the generator 10 stops at the end of the run. In a modification the resistance 19 is in circuit with the field winding 11, and the resistance 15 is replaced by a potentiometer connected across the leads 14, 18. In another modification, the potentiometer, or the resistance 15, is in circuit with the field 11. In a further modification, a standard valve 82, Fig. 7, is in circuit with an induction regulator 81 fed from A.C. mains. The field 11 is connected to the D.C. mains through the valve. The setting of the regulator 81 is varied with the cage position in the same manner as the position of the arm 20, Fig. 1, is changed. The valve 82 may be replaced by a rectifier.